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题型:阅读理解-阅读单选 难度:0.65 引用次数:109 题号:15186656

In April 2018, a group of Canadian scientists flying in a helicopter (直升飞机) discovered something they didn't expect to see — a huge, unknown cave with an opening the size of a football field.

The cave was discovered in the northern part of Wells Gray Provincial Park, in a wild, faraway area of Canada's Cariboo Mountains. The area is hard to get to and even harder to travel through. It is covered with snow for much of the year.   

The group told Catherine Hickson, a scientist who studies rocks, about the cave. Dr. Hickson got a team of researchers together to study it. In September, they went for a closer look after most of the snow melted (融化). The cave is one of the largest in Canada. Not only is the opening to the cave larger than a football field, the cave is also deep. The team couldn't measure (测量) all the way to the bottom, but they think it may be more than 180 meters deep. The cave is tens of thousands of years old. But the rock in the cave is made of used to be at the bottom of an ocean (海洋). It is hundreds of millions of years old.

A small, but fast river of melting snow leads into the cave on one side, creating a waterfall near the top and a river at the bottom. The water comes out again a long way away. The exit (出口) is about 2.1 kilometers away and about l/2 kilometer lower down.

The cave will have to wait to get an official name. For now, the cave is being called "Sarlacc's Pit "because it looks similar to the home of the Sarlacc, a person in the Star Wars movie Return of the Jedi.

For Dr. Hickson, there's a lesson to be learned from the cave. "It shows you that you don't know everything, "she says." There are things yet to be discovered."

1. Why did the cave remain unknown in the past?
A.It is in a wild mountain area.B.It has been there for just a few years.
C.Its opening is too small to be noticed.D.The weather there is cold all year round.
2. What are Paragraphs 4 and 5 mainly about?
A.The history of the cave.B.Some facts about the cave.
C.The value of studying the cave.D.The methods of studying the cave.
3. What does the underlined word "It" in Paragraph 4 refer to?
A.The snow.B.The river.C.The ocean.D.The rock.
4. The cave's name "Sarlace's Pit" has something to do with ________.
A.local cultureB.its discoverersC.the way it looksD.the name of a film star

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【推荐1】When it comes to the beaches in Sydney, it's hard to know where to begin. Around 100 beaches spread around the harbor and along the coast. Here are four of them.

Bronte Beach

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Balmoral, on the north shore's Middle Harbor near Taronga Zoo, has an air of peace. Life moves at a more leisurely pace here. If it's loudness and pride you're after, this isn't it. What Balmoral does have overall is impressive views. And its calmness makes it a great swimming spot for families.

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Located in the Royal National Park, 54 kilometers south of Sydney, Garie Beach is accessible through Garie Road and isn't one for beach-lovers without a car. The large beach is very impressive, though. It's well preserved and is the perfect spot for a relaxing day away from the city. The facilities are top-grade and there is a great fishing spot off the east-facing rocks.

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1. What do Bronte Beach and Balmoral have in common?
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B.They both charge no admission fee.
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2. What can we learn about Garie Beach?
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Is geography important? Here's a question for you to answer.

What have the following countries got in common: Australia, Japan, the United Kingdom, Iceland and Madagascar?

Quite easy if you can picture them on the globe — they are all islands. All of these nations are surrounded by sea.

What have these five nations got in common? Hungary, Botswana, Kazakhstan, Paraguay and Liechtenstein. They are all landlocked. In other words, in contrast to the first five countries whose coastline forms their border, the second five have no coastline at all. If you are a Hungarian or a Paraguayan, you have to pass through somebody else's country if you want to go to the beach.

Liechtenstein is even more of a geographical phenomenon; it is ''doubly landlocked'' because the countries that surround it — Austria and Switzerland are also landlocked. There is only one other country in the world in a similar position, Uzbekistan, which is surrounded by five other landlocked countries. Go and have a look at the map if you want to know which.

So how do countries become landlocked? If you are Swiss or Nepalese, you have probably never thought things could be any other way. Switzerland's mountains, like the Himalayas, have formed a natural boundary for thousands of years. But there are borders. Where one country ends and another begins is not something that is fixed for all time.

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【推荐3】At the beginning of the century there was a big farm called Hollywood Ranch. It was near Los Angeles in California. A few years later Hollywood was one of the famous places of the world. From 1910s to the 1950s Hollywood was the film center of the world. Every family knew the names of its film stars Charlie Chaplin, Grete Garbo, Bergman and hundreds more.

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